Trump's magic number
Remember, dear reader, the presidential primary is all about the delegates. So far Trump has 276 to Haley's 43. That total is so lopsided that the only real question left is when, not if, Trump will win. The next big primary day is March 12 — let's take a look at what Trump needs to do today in order to clinch the delegate majority of 1,215 on the 12th.
Here's the math: There are 199 delegates up for grabs in contests between March 8 and March 12. Assuming he wins all of those 199 delegates, he would need to win 1,215 - 199 = 1,016 by the time all Super Tuesday ballots are counted. As noted, he's already won 276 of those delegates, meaning he has to pick up 769 delegates more, out of the 865 delegates up for grabs tonight. That's about 89% — which is a little higher than the 87% of delegates he has won from states that have voted so far.
Trump could totally pull that off, in which case we would start calling him the "presumptive nominee" next Tuesday. Otherwise, he will have to wait until March 19, when there are 370 more delegates up for grabs.
—G. Elliott Morris, 538
Colorado Rep. Ken Buck on Super Tuesday races